That's because you're thinking of trucks used first and foremost for heavy duty "truck stuff." That is not the only market for trucks, at least in the US: https://www.thedrive.com/news/26907/you-dont-need-a-full-size-pickup-truck-you-need-a-cowboy-costume
According to Edwards’ data, 75 percent of truck owners use their truck for towing one time a year or less (meaning, never). Nearly 70 percent of truck owners go off-road one time a year or less. And a full 35 percent of truck owners use their truck for hauling—putting something in the bed, its ostensible raison d’être—once a year or less.
This is the same argument used for blaming the cost of college on government loans for education, for $$$ housing prices in cities that offer low income subsidies, for food prices due to food stamps...